(xemacs.info)Replace

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12.7 Replacement Commands
=========================

Global search-and-replace operations are not needed as often in Emacs as
they are in other editors, but they are available.  In addition to the
simple `replace-string' command which is like that found in most
editors, there is a `query-replace' command which asks you, for each
occurrence of a pattern, whether to replace it.

   The replace commands all replace one string (or regexp) with one
replacement string.  It is possible to perform several replacements in
parallel using the command `expand-region-abbrevs'.  Note: Expanding
Abbrevs.

Unconditional Replace

Replacing all matches for a string.

Regexp Replace

Replacing all matches for a regexp.

Replacement and Case

How replacements preserve case of letters.

Query Replace

How to use querying.